阅读下面材料, 在空白处填写1个适当的单词或用括号内单词的正确形式。
In Hebei Province lies a vast forest called
Saihanba. This green Great Wall, {#blank#}1{#/blank#} at its peak during the Qing Dynasty
covered thousands of hectares, had by the 1950s {#blank#}2{#/blank#}（virtual）disappeared. This allowed sand to
blow into Beijing from the northern deserts.
Saihanba is a combination of Chinese and
Mongolian, {#blank#}3{#/blank#}（mean）“beautiful
highlands". Until the Qing Dynasty, it was a royal hunting land because of
its cool summer weather and beautiful surroundings. However, most of the area
had turned into a desert by the end of the Qing Dynasty.
In fact 56 years ago there was only one
tree left. But without that tree, there {#blank#}4{#/blank#}（be）no miracle of Saihanba today. In the early 1960s, over 350 foresters
{#blank#}5{#/blank#}（send）to this area to
fight the desert. They were required {#blank#}6{#/blank#}（rebuild）the forest in Saihanba. Few people, including the foresters
themselves, believed they would succeed.
Their
doubt disappeared, however, when they found the 200-year-old tree, swaying
alone in {#blank#}7{#/blank#} wind. If one tree could survive here, {#blank#}8{#/blank#} could
millions of trees, they thought.
After decades of hard work, three
generations of the foresters have restored almost 80% of the original Saihanba
forest. Recently, they were awarded the {#blank#}9{#/blank#}（high）environmental honor from the United Nations for their great
{#blank#}10{#/blank#}（contribute）to
creating a greener world.
